So, I have to know........ (solid vs hyd)

I always used to run hydraulic cams. Then one day in about 1975 I put a 340 in my beat up old Landcruiser, and I decided I wanted NO possibility of lifter pump-up when screwing around in the sand and mud.

So I found a guy to grind a little mechanical cam, my instructions were that I wanted "as close as you can get to a 71 340 factory cam."

That thing was NOT real "lopey" but it pulled good and would wind over 7500, if you got a little carried away in the sand.

NOW THAT SAME CAM is in the "interim" engine in the 67

I sure like solid lifters. If I live long enough to build a 'real' engine for the 67, it's gonna have mechanical tappets.